$OpenBSD: patch-Source_x11_XWindowBuffer_m,v 1.1 2017/04/19 21:21:30 sebastia Exp $

fix warnings, from upstream

--- Source/x11/XWindowBuffer.m.orig	Thu Oct 20 10:34:49 2011
+++ Source/x11/XWindowBuffer.m	Wed Apr 19 09:00:03 2017
@@ -645,7 +645,7 @@ static int warn = 0;
         while (XCheckTypedEvent(window->display,
           XShmGetEventBase(window->display) + ShmCompletion, &e))
           {
-            [isa _gotShmCompletion: ((XShmCompletionEvent *)&e)->drawable];
+            [[self class] _gotShmCompletion: ((XShmCompletionEvent *)&e)->drawable];
           }
       }
     }
